Abstract
Investigations were carried out on the effect of the activity ratio of potassium to calcium and magnesium in the nutrient solution applied by drip irrigation on the growth and nutrient uptake of lettuce (Lactuca sativa var. Great Lakes 366) grown on Tottori sand dune soil. The of the soil solution was influenced by that of the nutrient solution. Calcium nutrition of lettuce was not influenced by the in the soil solution. However, the magnesium nutrition was improved at a low activity ratio, which resulted in the alleviation of the physiological injury.
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